Fatal error: Uncaught Error: Class "SebastianBergmann\Diff\LongestCommonSubsequenceTest" not found in E:\xampp\htdocs\key1\vendor\sebastian\diff\tests\MemoryEfficientImplementationTest.php:16 Stack trace: #0 {main} thrown in E:\xampp\htdocs\key1\vendor\sebastian\diff\tests\MemoryEfficientImplementationTest.php on line 16